Unity is not letting me Build

I have no idea why but Unity is preventing me from Building and Running my project. This is what popped up: UnityEditor.BuildPlayerWindow+BuildMethodException: 2 errors at UnityEditor.BuildPlayerWindow+DefaultBuildMethods.BuildPlayer (UnityEditor.BuildPlayerOptions options) [0x002bf] in :0 at UnityEditor.BuildPlayerWindow.CallBuildMethods (System.Boolean askForBuildLocation, UnityEditor.BuildOptions defaultBuildOptions) [0x00080] in :0 UnityEditor.BuildPlayerWindow:BuildPlayerAndRun()